热缩型纤维调控大体积混凝土抗裂性能研究  

Study on crack resistance of large-volume concrete regulated by heat-shrinkable fibers

作　　者：吴引道 李进辉 虞子 王君[3] 龚晨洁 解鹏洋 丁庆军[3] WU Yindao;LI Jinhui;YU Zi;WANG Jun;GONG Chenjie;XIE Pengyang;DING Qingjun(CCCC Mechanical&Electrical Engineering Co.Ltd.,Beijing 100027,China;College of Material Science and Engineering,Wuhan Textile University,Wuhan 430200,China;State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;China New Building Materials Design and Research Institute Co.Ltd.,Hangzhou 310022,China)

机构地区：[1]中交机电工程局有限公司,北京100027 [2]武汉纺织大学材料科学与工程学院,湖北武汉430200 [3]武汉理工大学硅酸盐建筑材料国家重点实验室,湖北武汉430070 [4]中国新型建材设计研究院有限公司,浙江杭州310022

出　　处：《新型建筑材料》2024年第7期113-116,共4页New Building Materials

基　　金：国家自然科学基金面上项目(52278274)。

摘　　要：研究了高模量热缩型纤维与具有高微细连通孔的内养护集料协同作用对大体积混凝土力学性能、抗裂性能、收缩性能的影响,并进行了微观机理分析。结果表明:复掺热缩型纤维和内养护集料对大体积混凝土力学性能影响较小,但能明显提高大体积混凝土的抗裂性能并降低收缩变形,最大裂缝宽度和单位面积的总开裂面积较基准组分别降低了85.7%、94.9%,干燥收缩值降低了47.6%。SEM分析表明,热缩型纤维及内养护集料与胶凝浆体紧密结合、界面致密,从而提高了大体积混凝土的抗裂性能。This paper studied the synergistic effect of high modulus heat shrinkable fibers and internal curing aggregates with highly micro connected pores on the mechanical properties,crack resistance and shrinkage properties of large-volume concrete,and the microscopic mechanism analysis was carried out.The results show that the remixing of heat shrinkable fiber and internal curing aggregate has little effect on compressive strength,but it will improve the crack resistance performance of large-volume concrete and reduce reduce shrinkage deformation.The maximum crack width and total crack area per unit area decreased by 85.7%and 94.9%respectively compared to the benchmark group,and the drying shrinkage value decreased by 47.6%.SEM tests show that the heat shrinkable fiber and the inner curing aggregate are tightly combined with the cement paste and the interface is dense,thereby improving the crack resistance of large-volume concrete.

关 键 词：大型混凝设备基础 大体积混凝土 热缩型纤维 内养护集料 抗裂性能 

分 类 号：TU528[建筑科学—建筑技术科学]